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Timer problem in LPC2148

Hi Everyone. I had done code for timer0 in LPC2148 to increment a no. for every sec. But while executing it increments for every 10 sec. I dont know what went wrong. Someone pls help. Thanx in advance.
Clock Freq: 12Mhz.

#include<lpc214x.h>
#include"lcd.h"

#define PCLK 12000000

void init(void);
void lcd_init(void);
void gpio_init(void);
void timer0_init(void);
void timer0_int_init(void);
__irq void Timer0(void);

unsigned int x, cnt;

int main()
{
        init();
        lcd_init();
        gpio_init();
        timer0_int_init();

        read(0x80);
        lcd_dis("TIMER0 TEST PRGM", 16);

        timer0_init();

        while(1)
        {
                read(0xc0);
                hex_dec2(x);
        }
}

void gpio_init()
{
        PINSEL0 = 0x00000000;
        PINSEL1 = 0x00000000;
        IODIR0  = 0xFFFFFFFF;
}

void timer0_init()
{
        PCONP |= (1<<1);// Enable Power control for Timer0
        T0CTCR= 0x00;   // Set Timer mode
        T0PR  = 0x2EDF; // Set Prescale to 11999 to get 1msec delay
        T0TCR = 0x02;   // Reset Timer0
        T0MR0 = 0x3E8;   // Match reg value for 1sec delay
        T0MCR = 0x03;   // Enable interrupt and resets TC when match occurs
        T0TCR = 0x01;   // Enable Timer0
}

void init(void)
{
   PLL0CFG = 0x00;    // MSEL = 1,PSEL = 1
   PLL0FEED = 0xAA;   // Feed process
   PLL0FEED = 0x55;

   PLL0CON = 0x01;
   PLL0FEED = 0xAA;   // Feed process
   PLL0FEED = 0x55;

   while(!(PLL0STAT & 0x400));   // Wait until PLL Locked

   PLL0CON = 0x3;       // Connect the PLL as the clock source
   PLL0FEED = 0xAA;     // Feed process
   PLL0FEED = 0x55;

   MAMCR = 0x2;         // Enabling MAM and setting number of clocks used for Flash memory fetch (4 cclks in this case)
   MAMTIM = 0x4;

   VPBDIV = 0x01;       // PCLK = CCLK
}

void timer0_int_init(void)
{
        VICVectAddr0 = (unsigned)Timer0;
        VICVectCntl0 = 0x20|4;
        VICIntEnable |= (1<<4);
}

__irq void Timer0(void)
{
        T0IR=0x01;
        VICVectAddr=0x0;
        x++;
}